题型:问答题 Look at the trouble I am in! If only I ________ more careful when driving. [ ] A. was B. would beC. had been D. should be 查看答案
题型:问答题 除去下列括号内的杂质,所加试剂和操作均正确的是( )选项需除杂的物质试剂操作AFe2O3(Al2O3)NaOH溶液过滤BCO2(HCl)NaOH溶液将气体通过洗气瓶CNaCl(Na2CO3)稀硫酸蒸发结晶DNH3(H2O)浓硫酸将气体通过洗气瓶A.AB.BC.CD.D 查看答案